Measuring and displaying frequency and amplitude

[CodyW]

G'day Everyone,

I was just wondering if anyone knew how could I go about measuring and displaying the frequency and amplitude of a wave onto a 8x2 LCD screen? How hard would this be?

Thanks,
Cody

[KJDS]

Audio? RF? dynamic range required?

[CodyW]

Audio? RF? dynamic range required?

Just audio.

[Dave]

Like a graphic equalizer?
Look up FFT (Fast Fourier Transform).

[Marco]

There are a couple microcontroller spectrum analyser projects using FFT... you could just adapt one of those and just look for the largest component, this will give you a frequency and amplitude.

Not necessarily precise enough, but then you haven't said what kind of precision you want.

[Zad]

If you know that you are measuring a single frequency (pure sinusoid) signal, you can just measure the time between zero-crossing points.